Considerable effort was invested in the first option. The Copenhagen
interpretation [1]} of Quantum Mechanics involving
quantum jumps and a limited ontology of waves of fields is reasonable
but ugly. Penrose [2]} is probably correct to speculate
that the Hidden Variable [3]}, [4]}
and the Guiding Fields [5]}, [6]}, [7]}
approaches do not work. New experiments involving quantum interferences
under gravitation [8]} seem to exclude decoherence
by gravitation [2]}. Deterministic approaches like
the “Cellular Automaton” advocated by 't Hooft [4]}
somehow lack motivation as they also lead to similar complications
as the ones discussed below.
